Electric fan



FIG. 1 is a perspective view of an electric fan showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of environmental structure in FIGS. 1, 3, 4, and 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an "electric fan," as shown and described. 